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Development of a Propagating Millimeter-Wave Beam Position and Profile Monitor in the Oversize Corrugated Waveguide Used in an ECRH System

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Abstract

In a high-power electron cyclotron resonance heating (ECRH) system for plasma heating, a long-distance and low-loss transmission system of the millimeter wave is required. A real-time monitor of the millimeter-wave beam position and its intensity profile, which can be used in a high-power, evacuated, and cooled transmission line, is proposed, designed, manufactured, and tested. The beam-position and profile monitor (BPM) consists of a reflector, Peltier-device array, and a heat-sink, which is installed in the reflector-plate of a miterbend. The BPM was tested using both simulated electric heater power and high-power gyrotron output power. The profile obtained from the monitor using the gyrotron output was well agreed with the burn patter on a thermal sensitive paper. Methods of data analysis and mode-content analysis of a propagating millimeter-wave in the corrugated waveguide are proposed.

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Acknowledgments

This work is supported by the National Institute for Fusion Science under grant ULRR701, ULRR801, and ULRR804, and is also supported by a grant for scientific research from the Ministry of Education, Science and Culture of Japan (21560058, 24560066).

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Authors and Affiliations

  1. National Institute for Fusion Science, Toki City, 509-5292, Japan

    Takashi Shimozuma, Sakuji Kobayashi, Satoshi Ito, Yasuhiko Ito, Shin Kubo, Yasuo Yoshimura, Hiroe Igami, Hiromi Takahashi, Yoshinori Mizuno, Kohta Okada & Takashi Mutoh

  2. Graduate School of Frontier Science, The University of Tokyo, Chiba, 277-8561, Japan

    Masaki Nishiura

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  1. Takashi Shimozuma
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  2. Sakuji Kobayashi
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  3. Satoshi Ito
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  4. Yasuhiko Ito
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  5. Shin Kubo
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  7. Masaki Nishiura
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  8. Hiroe Igami
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  9. Hiromi Takahashi
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  10. Yoshinori Mizuno
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  11. Kohta Okada
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  12. Takashi Mutoh
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Correspondence to Takashi Shimozuma.

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Shimozuma, T., Kobayashi, S., Ito, S. et al. Development of a Propagating Millimeter-Wave Beam Position and Profile Monitor in the Oversize Corrugated Waveguide Used in an ECRH System. J Infrared Milli Terahz Waves 37, 87–99 (2016). https://doi.org/10.1007/s10762-015-0196-y

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  • DOI: https://doi.org/10.1007/s10762-015-0196-y

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